Combination square and protractor



Oct. 27, 1931.

w. GRIOZJ 1,828,930

COMBINATICSN SQUARE AND PROTRACTOR 2 Sheets-Shea! 1 Filed Feb. 24, 1928Pl/eseZ Groz/ B QM Attornqy Oct. 27, 1931. w, GRQZ| CQMBINATION SQUAREAND PROTRACTOR Filed Feb. 24, 1928 2 Sheets-She's! Invenmr WveZ V rozzAttornqy Patented Oct 27, 1931 UNITED. STATES:

l,828,93ll

TENT I OFFICE- wEsE LY GR-OZI, or mnm NAro Is, INDIANA commA'nonsounnnnnn PROTRACTOR Application filed February 2'4, 192e. seen No.256,641.

The present invention relates generally to a tool combining the featuresof an ordinary square .with a protractor and has for its prime object toprovide a device of this nature which is useful whenever there is anywork to be set up or checked, especially when the work is on parallelsand cannot be reached very handily with a square or a A still furthervery important object ofthe invention resides in the provision of adevice of this nature which is exceedingly simple in its construction,easy to manipulate, inexpensive to manufacture, convenient, andthoroughly eflicient andrehable use.

WVith the above and numerous other objects in view as will appear as thedescription proceeds, the invention resides in certain novel features ofconstruction and in the combination and arrangement of parts as will behereinafter more fully described and claimed.

In the drawings: Figure l is an elevation of the device showing the samein various positions for operation,

Figure 2 is a detailed enlarged sectional view taken substantially onthe line 2-2 of Figure 1, Figure 3 is an elevation of the protractorhead,

Figure. 4 is an edge elevation of a slide, Figure 5 is a side elevationthereof, Figure 6 is an end elevation thereof, Figure 7 is a plan viewof onesection of the head,

Figure 8 is an edge elevation thereof, Figure 9 is a detail sectiontaken substantially on the line 99 of Figure 3, and Figure 10 is asection taken substantially on the line 10-10 of Figure 1.

Referring to the drawings in detail it will be seen that the numeral 5denotes the blade and the numeral 6 the slide member of an 0 ordinarysquare well known in the art. The

Another very important object of the in-v blade 5 is provided on oneface with a longitudinally extending groove 7 in the usual wellknownmanner. The numeral 8 denotes a slide member having extendinginwardly from onelongitudinal edge a longitudinally extending recess9*for receiving the blade similar to the slide member6. Intermediatetheendsthereof, theslide 8 is provided with abore' lOopening at one endinto said recess 9, and at its opposite end opening outwardlyioo oft-heslide. I r

Two pairs of apertured cars 12 are provided on the slide member 8, onepair at each corner of the slide at the free longitudinal edge of theslide. with a relatively thin shank projection 15 having a.lateral'enlargement at its terminal indicated at 16 for reception in thegroove 7, the bolt 14 extending through the bore 11.

A nut 17 is threaded on the bolt so that the slide may be tightened onthe blade 5 in different adjusted positions aswill be apparent. A'pairof arms 19 and 20 are pivotally engaged with the ears 12 as indicated at13.

A pointer 23 is pivoted intermediate the ends of the arms 19 and 20 asat 22 and 23 respectively and has a pointed end extension 25 forcooperating with indicia 26 provided on the plate 27 formed integrallyon an intermediate portion of the arm 19. The distance 801 betweenpivots 22 and 23 is equal to the distancebetween pivots 13 so that thearms alwaysswing together and retain their parallelism in respect toeach other. A head 26a is provided with ears 27 a pivoted to theextremities of the arms 19 and 20. This head is provided with an annularrecess 28 in which is rockable a member 29; The member 29 andthe head 26are provided with registering apertures :30 and 31 respectively; Anenlargement 32 is formed on the member 29 and has a slot33 for receivingblade 34 formed with straightlongitudinal parallel edges and beveled endedges. This blade 34 has a longitudinally extending groove 35in whichthe positions. The member29 and the head 26a The bolt 14 is provided 65are provided with registering arcuate slots 40 and l1 respectivelythrough which extends a bolt 42 on which may be tightened a nut 43 forholding the member 20 in adjusted positions in respect to the head 26athus thereby holding the blade 34 at a desired angle with respect to thehead.

Suitable indicia 46 is provided on the member 29 so that the angle ofthe blade to the head may be readily ascertained, a pointer e606 beingprovided on head 26a, and against which the graduations or indicia 46may be read for this purpose.

From the above detailed description it will be seen that the combinationtool may be used in various different ways such as the three differentways illustrated in Figure 1 for testing the accuracy of the angularityof various machine done work.

It is thought that the construction, opera tion, utility and advantagesof the invention will now be quite apparent to those skilled in this artwithout a more detailed description thereof. The present embodiment ofthe invention has been disclosed in detail merely by way of examplesincev in actual practiceit attains the features of advantage enumeratedas desirable in the statement of the invention and the abovedescription.

It will be apparent that changes in the details of construction, and inthe combination and arrangement of parts may be resorted to withoutdeparting from the spirit or scope of the invention as hereinafterclaimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is:

1. In a device of the class described, a slide member, a pair of spacedparallel arms'of equal length pivoted at one end to said slide member, ahead member pivoted to the free ends of said arms, the distance betweenthe pivots of the respective pairs of pivots being equal, one 01" saidarms being provided with an arcuate series of graduations, a pointerpivoted to said arms and adapted to be read against said graduations, amember rockably mounted on said head and provided with a slot, a bladeoperable in said slot, means for re nin said blade in a predeterminedadjused position in said slot and for movement with said member forangular adjustment relative to said head.

2. In a device of the character described, the combination of a squareincluding a blade, a slide mounted on said blade for adjustment relativethereto, a pair of spaced parallel arms pivoted at one end to saidslide, a plate integral with one of said arms and having a scale formedthereon, a pointer pivoted to said arms and adapted to be read againstthe graduations of the scale, a head pivoted to the free ends of saidarms and provided \vith a recess, a member rotatably mounted 111 saidrecess and provided with an enlarge-.

ment having a slot, a blade shiftable in the slot, means for retainingsaid blade in a predetermined adjusted position in said slot, means forretaining said member in a predetermined rotative position, and saidmember being provided with a scale, and said head being provided with afixed pointer adapted to be read against the scale of said member.

3. In a device of the character described, a pair of spaced parallelarms of equal length, one of said arms being provided with a plateintegral therewith intermediate the ends of said one arm, a scale havingits graduations arranged in an arcuate series provided on said plate, apointer pivotally connected to said arms and adapted to be read againstthe graduations of said scale, a slide pivoted to said arms at one endof the latter, the dis tance between the pivots of the respective pairsof pivots being equal whereby said arms will maintain their parallelrelation relative to one another when said arms are swung about theirpivots relative to said slide, a head pivotallyconnected to the freeends of said arms, a member rotatably mounted on said head, means forretaining said member in a predetermined rotative position relative tosaid head, a blade having straight parallel edges and bevelled endedges, and means for adjustably securing said blade on said member forrotation with said member for varying the angular relation between saidblade and said arms.

In testimony whereof I afiix my signature.

WESELY GROZI.

